A character style's OpenType features took nine tags. OtFeatures now
also keeps ss01-ss20, salt, titl, pnum, lnum, sups and subs (off by
default, one bit each in `extra`): they are accepted by the type
commands, stored with the style and passed to the shaper, so a font
that has them uses them.
The Affinity import test used ss01 as its example of a feature kept but
not rendered; it now uses cv01 for that (character variants still
aren't rendered) and keeps ss01 as one that is.
Fixes#1607
The follow-up #966 left room for. With automatic kerning, horizontal type
with Proportional Metrics also applies `apkn`, and vertical type applies
`vkrn` and `vapk` along with `vpal`. Manual kerning turns them off, as it
turns off `kern`.
Vertical kerning used to cancel out: both top-to-bottom shapings had
harfrust's default `vkrn`. The baseline now has neither `vpal` nor the
kerning, so their difference carries both. A third shaping (`vpal` alone)
tells which advances `vpal` itself changed, and mojikumi steps aside only
for those. Vertical type without Proportional Metrics isn't kerned, as
before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The second half of #966. With Proportional Metrics on, a vertical segment is
also shaped top to bottom, with and without `vpal`: the difference gives
each glyph's change of advance down the column and its x and y placement.
An upright glyph (not tate-chu-yoko) in a font with vertical metrics takes
them on top of its cell, so it moves with its shorter cell; a font without
vertical metrics keeps `upright_cell`'s cell, and with the switch off
nothing is shaped twice and the column is as before.
As in horizontal type, Line-end Punctuation Half Width takes nothing more
off the punctuation `vpal` re-spaced and trims the punctuation it leaves
full height as before. Docs: mcp.md, and Proportional Metrics leaves the
missing lists in gaps.md, type-parity.md and target-app-parity.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A character attribute (Character panel menu with the East Asian options;
`text.setFormat` / `text.setRangeStyle {proportionalMetrics}`), saved only
when on. In horizontal type it applies `palt`; vertical type sets as before
until the vertical shaping change (`vpal`) follows.
Line-end Punctuation Half Width takes nothing more off the punctuation
`palt` re-spaced (the flush opening bracket, consecutive punctuation, the
line-end half width): the segment is shaped once more without `palt`, and
the glyphs whose advance differs are marked. Punctuation the font leaves
full width is trimmed as before. SVG writes `"palt" 1` with the
character's other features.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
#583 kept ligatures within +-50/1000 em. Adobe's composers are described
as dropping them past about -8% and +22% of the word space (John Hudson,
www-style, 2012-07): about -20 and +55 for a typical 250/1000 em space.
Condensed type shows a fixed ligature sooner than expanded type does.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Only real letterspacing (|tracking| > LIGATURE_TRACKING_LIMIT = 50/1000 em)
drops standard ligatures now, and an explicit liga/clig in the character's
features always wins. The OpenType panel's hint follows the same rule.
Builds on the vertical type from #145 (same data, commands and tools).
- Kinsoku (the strict set, horizontal Japanese too): no line starts with a
closing bracket, 、。, a middle dot, colon, !?, the long vowel mark,
iteration marks or small kana; no line ends with an opening bracket.
Hyphenation breaks obey it too.
- Tate-chu-yoko: a run of two or three half-width digits (10月, 第100回)
stands upright across the column as one block one em long, squeezed to
the em when wider; longer numbers stay on their side.
- Upright or on its side by Unicode's Vertical_Orientation: CJK and
symbols upright, marks that need a vertical form on their side when the
font has none; upright glyphs advance at least one em, centred, and turn
about the ideographic em box centre so they sit on the column's centre
line. Point type keeps its anchor on the first column's centre line.
- `vrt2` is no longer requested: its glyphs are already on their side, so
with the layout turning Latin and digits too they came out upside down
(and tate-chu-yoko blocks broke) in fonts that have it, e.g. Hiragino.
- The line→text mapping is one affine (`TextLayout::line_xf`, an exact
quarter turn plus the point-type offset); `logical_point` and
`physical_point` use it. Pixel snapping skips vertical type.
- Tests: kinsoku in both directions, tate-chu-yoko blocks, upright vs
sideways, anchor on the centre line, arrows along columns.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Gert Pellin